Finely chop the mocha beans. Dissolve coffee powder in 1 tbsp. hot water while stirring. Chop the dark chocolate coating and melt in a bowl over a warm water bath
Cream butter, egg, sugar and salt with the whisk of the hand mixer. Stir in melted chocolate coating, coffee and chopped mocha beans. Mix flour and baking powder and knead in with your hands. Wrap the dough in foil and chill for approx. 2 hours
Roll out the dough on a baking tray lined with baking paper to a thickness of about 0.5 cm. Bake in the preheated oven (electric cooker: 175 °C/ convection oven: 150 °C/ gas: level 2) for approx. 15 minutes. Remove and immediately cut into squares (approx. 4 x 4 cm) with a sharp knife or pastry wheel, leave to cool
Coarsely chop the white couverture and coconut oil and melt in a bowl over a warm water bath. Dip the cookies diagonally halfway into the couverture, strip off the undersides and place on a cake rack. Decorate with coffee or mocha beans, let dry
waiting time approx. 2 1/2 hours